#### AC Fundamentals | Interview MCQ | AC Power Fundamentals Module

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Alternating Current, Circuits, AC: Certain circuits include sources of alternating electromotive forces of the sinusoidal form V = V0 cos(ωt). alternating current (AC), how it works, basic AC source and AC generators, difference between AC.

- to amplify certain frequencies
- to reject a small band of frequencies
- both (a) and (b)
- as a high impedance

**Question 1:** A parallel resonant circuit can be used?

**Answers:** both (a) and (b)

- narrower its pass band
- sharper its resonance
- broader its resonance curve
- greater its bandwidth

**Question 2:** Higher the Q of a series circuit?

**Answers:** narrower its pass band

- decrease of capacitance and decrease of resistance
- decrease of capacitance and increase of resistance
- increase of capacitance and decrease of resistance
- increase of capacitance and increase of resistance

**Question 3:** Time constant of a capacitive circuit increases with the?

**Answers:** increase of capacitance and increase of resistance

- 1.414 Imax
- 0.707 Imax
- 0.5 Imax
- 0.9 Imax

**Question 4:** For a sine wave with peak value Imax the RMS value is?

**Answers:** 0.707 Imax

- average value to RMS value
- none of the above
- RMS value to average value
- peak value to RMS value

**Question 5:** The form factor is the ratio of?

**Answers:** RMS value to average value

- high
- very low
- low
- very high

**Question 6:** At ...... frequencies the parallel R-L circuit behaves as purely resistive?

**Answers:** very high

- replaced by source resistance
- open-circuited
- replaced by capacitance
- short-circuited

**Question 7:** To neglect a current source, the terminals across the source are?

**Answers:** open-circuited

- the current can lead or lag by 90º
- the current is in phase with the voltage
- the current lags behind the voltage by 90º
- the current leads the voltage by 90º

**Question 8:** In a pure inductive circuit?

**Answers:** the current lags behind the voltage by 90º

- will increase the selectivity of the circuit
- will change the maximum value of current at resonance
- will change the impedance at resonance frequency
- will change the resonance frequency

**Question 9:** In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value ?

**Answers:** will increase the selectivity of the circuit

- none of the above
- either (c) or (d)
- series
- parallel

**Question 10:** Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

**Answers:** parallel

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**Correct: **0 **Wrong: **0

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